The carriage has a row of 8 digits above, which is the counter, and a row of 16 digits below, which is the accumulator. Let's remove it.

Take two screwdrivers, and unscrew, simultaneously, the screw heads indicated on either side of the carriage.

The left screw head is attached to a screw, while the right one is just a head attached to a shaft.

4-48 machine screw, 1/4"

Carriage shaft, 0.249" diameter

Use an awl to poke the shaft from the left side so that it comes out the right side. Pull the shaft out completely.

Pull back the carriage hook arms and lift the carriage off.